Overlays: Difference between revisions

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VisualWikitext

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 === Python Packages Overlay ===
-Here is an example of Python packages overlay. The trick is to also override python itself with `packageOverrides`.
+Here is an example of Python packages overlay. The trick is to also override python itself with <code>packageOverrides</code>.
 Github issue with the snippet below: [[https://github.com/NixOS/nixpkgs/issues/26487#issuecomment-307363295]]
@@ Line 280: / Line 280: @@
 }
 </syntaxhighlight>
+=== R Packages Overlay ===
+Here is an example of an R packages overlay in which it can be seen how to provide different versions of packages then those provided with the used R version. It should be notice that in the case of R and Python the argument to `override` is named differently. Names of these can be find using <code>nix repl</code> and evaluating e.g. <code>python.override.__functionArgs</code>.
+<syntaxhighlight lang="nix">
+self: super:
+{
+  rPackages = super.rPackages.override {
+    overrides = {
+      rprojroot = super.rPackages.buildRPackage rec {
+        name = "rprojroot-${version}";
+        version = "2.0.2";
+        src = super.fetchurl {
+          url =
+            "https://github.com/r-lib/rprojroot/archive/refs/tags/v2.0.2.tar.gz";
+          sha256 = "1i0s1f7hla91yw1fdx0rn7c18dp6jwmg2mlww8dix1kk7qbxfjww";
+        };
+        nativeBuildInputs = [ super.R ];
+      };
+      here = super.rPackages.buildRPackage rec {
+        name = "here-${version}";
+        version = "1.0.1";
+        src = super.fetchurl {
+          url = "https://github.com/r-lib/here/archive/refs/tags/v1.0.1.tar.gz";
+          sha256 = "0ky6sq6n8px3b70s10hy99sccf3vcjjpdhamql5dr7i9igsf8nqy";
+        };
+        nativeBuildInputs = [ super.R self.rPackages.rprojroot ];
+        propagatedBuildInputs = [ self.rPackages.rprojroot ];
+      };
+    };
+  };
+}
+</syntaxhighlight>
 ==== References ====